제출 #304807

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
304807		sofapuden	Colors (BOI20_colors)	C++14	0 / 100	0 ms	256 KiB

Colors

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

ll fS(ll x){
	ll lo = 1, hi = x, cn = 0, ans = 0, out = 0;
	while(lo <= hi){
		if(cn&1)ans-=(lo+hi)/2;
		else ans +=(lo+hi)/2;
		lo = (lo+hi)/2+1;
		out = min(out, ans);
		cn++;
	}
	return out;
}
		
		

int main(){
	ll n; cin >> n;
	ll start = -fS(n)+1;
	cout << "? " << start << endl;
	ll tr; cin >> tr;
	ll lo = 1, hi = n, best = n, cn = 0, ans = start, x;
	while(lo <= hi && lo != n){
		int mid = (lo+hi)/2;
		if(cn&1)ans-=mid;
		else ans+=mid;
		cout << "? " << ans << endl;
		cin >> x;
		if(x){
			best = mid;
			hi = mid-1;
		}
		else{
			lo = mid+1;
		}
		cn++;
	}
	cout << "= " << best << endl;
}

	
	

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